Burglar-alarm.



S. G. GERLAGH. BUBGLAR ALARM. APPLICATION FILED APR. 17, 1914.

Patented Dec. 29, 1914.

Jzephem a r FEED SATES PATENT @FFKCE.

STEPHEN G. G-ERLACH, OF BAN'I'AM, CONNECTICUT.

BURGLAR-ALAR-M.

Application filed April 17, 1914.

T 0 all whom it may concern Be it known that L STEPHEN G. GERLACH, acitizen of the United States, residing at Bantam, in the county ofLitchfield and State of Connecticut, have invented new and usefulImprovements in Burglar-- Alarms, of which the following is aspecification.

The general object of this invention is to announce the unlawfultampering with the lock of a door or the like, by a noise producingelement, which is adapted to be operated by the actuation of the lock.And to these ends the invention consists of a casing and a firing pin,and arranging the casing so as to receive the firing pin, in securing ameans to the spindle of the lock and arranging the same for engaging thefiring pin, so that upon the turning of the spindle the firing pin willbe actuated.

Other objects will appear and be better understood from that embodimentof my invention of which the following is a specification, referencebeing had to the accompanying drawings forming part hereof, in whichFigure l is a perspective view of my improved lock, Fig. 2 is a sideelevational View of the lock having a portion of the front broken awayfor the sake of clearness, and Fig. 3 is a detail perspective view of aportion of the trigger and firing pin.

As shown in the drawings, 5 indicates a lock-casing, 6 a firing pin, 7 aspring for actuating the firing pin and. S a trigger piece mounted onthe lock spindle 9 and arranged for engagement with the firing pin.

The lock casing may be any of usual structure and formed of any suitablemetal such as iron, bronze or the like. At one side of the interiorthereof, the casing is provided with a pair of depending lugs 10l0 whichare bored so as to slidingly receive the rod 6; and located betweenthese lugs and preferably formed integral with the casing, is a ledge11, whose function will be presently described. At one end thereof, thecasing is also provided with an enlarged or solid portion 12, which isprovided with bore 13. This bore is in axial alinement with the rod 6,and is of suitable caliber so as to receive a blank cartridge 14L asshown, and for the purpose of providing finger room for inserting acartridge in the bore Specification of Letters Patent.

Patented Dec. 29, 1914. Serial No. ceases.

13, or removing a fired cartridge the casing 5 is cut away as indicatedat 15.

The rod 6 is slidably fitted in the lugs 10-10 and is adapted to operateas a firingpin for the cartridge 14, by virtue of the spring 7projecting the firing-pin thereagainst. The spring 7 is wound around thefiring-pin and is located between the lugs 10, and in order to retainthe spring in position, a cross-piece 16 is provided on the firing pinas shown. This cross-piece is adapted to operate as a cockingpiece forthe firing-pin, for it will be seen that as the firing-pin is drawnbackwardly or away from the cartridge, the cocking-piece may be engagedby the ledge 11, upon a slight turn being given to the firing-pin; andby virtue of the spring being compressed between the lug l0 and thefiring pin may be held in substantially fiXed position. At the rear endthereof, the firing-pin is provided with an angularly disposed portion17, which operates as a sear for the firing-pin, as will be hereafter described, and for the purpose of permitting the free action of thisportion 17, the casing of the lock is cut away as shown at 18..

The trigger-piece 8 may be made of any suitable material, and for thepurpose of being fixedly positioned on the spindle 9 of the door knob,an annular opening 19 is provided for the reception of the spindle; thusit will be seen that as the spindle is turned in either direction thetrigger-piece is rotated in unison therewith. The upper end of thetrigger-piece is provided with a substantially V-shaped cut-awayportion, which is adapted to receive the portion 17 of the firing pin,when the latter is in the cooked position as shown in Figs. 1 and 3. Byvirtue of this cut-away portion, having oblique sides, it will be seenthat as the trigger piece is rotated by the spindle, these oblique sidestend to cam the portion 17 upwardly, as shown in Fig. 2 and in dottedlines in Fig. 3. Now, as the sear portion is being cammed upwardly, itis obvious, that the firing-pin will be rotated in a lateral direction,thus disengaging the cookingpiece from contacting with the ledge 11,whereupon the spring, being released will project the firingpin againstthe cartridge and explode the same.

It is obvious that those skilled in the art cocking piece, the

may vary the details of construction and arrangement of parts Withoutdeparting from the spirit of my invention and therefore I do not Wish tobe limited to such features except as may be required by the claims.

What I claim as new is:

1. In combination With a lock casing provided With bearings, a knobspindle and having one end adapted to receive a noiseproducing element,and a firing-pin slidably mounted in the said bearings, the saidfiring-pin having one end provided with an angularly disposed portion,means for projecting the firing-pin against the noiseproducing element,and means mounted on the knob spindle of the lock-casing and arrangedfor engaging with the angularly disposed portion of the firing-pin forthe purposes set forth.

2. In combination with a lock casing provided with bearings, a knobspindle and having one end adapted to receive a noiseprodueing element,and a firing-pin slidably mounted in the bearings and adapted to engageWith the noise-producing element, the said firing-pin being providedWith an anguiarly disposed portion, means for directing the firing-pinagainst the noise-producing element, means mounted on the firingpin andarranged for engagement with the lock-casing for holding the firing-pinout of operative engagement With the noise-producing element, and meansmounted on the knob-spindle and arranged for engaging with the angularlydisposed portion of the firing-pin for the purposes set forth.

In testimony whereof I atliX my signature in presence of two Witnesses.

STEPHEN G. GERLACH. lVitnesses FrLLMonn BROWN, WM. P. CRossMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G.

